English: City of Siegen (Westphalia, Germany): Blocked entrance of the mining adit Hainer Stollen, located in the east side of the Siegberg mountain. During late WWII, this centuries-old iron ore mine was specially prepared in a secret operation of the national socialist regime. In 1944, it was used to host important cultural artifacts and pieces of art of Westphalian churches and museums as a protection from air raid damage. Among these items were the Aachen Cathedral Treasury (Aachener Domschatz) and the casket with the remains of Charlemagne (Karlsschrein). In April 1945, the treasury in the adit was detected by U.S. troops who returned the items to their original places in May 1945.
Deutsch: Siegen/Westfalen: Vermauertes Stollenmundloch des Hainer Stollens im Osthang des Siegbergs. Der jahrhundertealte, später ausgebaute Eisenerzstollen wurde 1944–1945 vom nationalsozialistischen Regime dafür benutzt, um wichtige Kunstschätze, unter anderem aus rheinischen Kirchen und Museen vor Kriegseinwirkungen zu schützen. Darunter befanden sich unter anderem der Aachener Domschatz sowie der Karlsschrein mit den Gebeinen Karls des Großen. Im April 1945 wurden die Kunstschätze von US-Truppen entdeckt, unter Bewachung gestellt und im Mai 1945 an ihre Ursprungsorte zurückgeführt.
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{{Information |Description={{en|1=City of Siegen (Westphalia, Germany): Blocked entrance of the mining adit ''Hainer Stollen'', located in the east side of the ''Siegberg'' mountain. During late WWII, this centuries-old iron ore mine was specially prepare